NETGIS documentazione di sistema

This work presents NetGIS, an environment to specify, analyze and execute visual programs for Geographical Information Systems. The lack of a sophisticated user interface is one of the major drawbacks to Gegraphical Information Systems (GIS), particularly for people without a Sound background in computer science. The use of a visual language approach in proposed here to hide the plethora of basic GIS functions while providing ready-to use tools to solve user s sub-tasks. NetGIS is based on the module concept, conceived as a software building block that impllements a solution to a general subtask and is presented to the user through a structured icon. Complex GIS queries or tasks can be carried out by interconnecting module into flow networks, using a direct manipulation approach